The logarithm to the base 10 of x, element-wise. NaNs are
returned where x is negative.

See also

emath.log10

Notes

Logarithm is a multivalued function: for each x there is an infinite
number of z such that 10**z = x. The convention is to return the
z whose imaginary part lies in [-pi, pi].

For real-valued input data types, log10 always returns real output.
For each value that cannot be expressed as a real number or infinity,
it yields nan and sets the invalid floating point error flag.

For complex-valued input, log10 is a complex analytical function that
has a branch cut [-inf, 0] and is continuous from above on it.
log10 handles the floating-point negative zero as an infinitesimal
negative number, conforming to the C99 standard.